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/*
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* Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// 包声明，定义了这个类所在的包路径
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package net.micode.notes.widget;
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// 导入所需的Android类和接口
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import android.app.PendingIntent;
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import android.appwidget.AppWidgetManager;
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import android.appwidget.AppWidgetProvider;
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import android.content.ContentValues;
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import android.content.Context;
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import android.content.Intent;
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import android.database.Cursor;
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import android.util.Log;
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import android.widget.RemoteViews;
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// 导入应用特有的类和接口
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import net.micode.notes.R;
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import net.micode.notes.data.Notes;
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import net.micode.notes.data.Notes.NoteColumns;
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import net.micode.notes.tool.ResourceParser;
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import net.micode.notes.ui.NoteEditActivity;
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import net.micode.notes.ui.NotesListActivity;
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// 定义一个抽象类NoteWidgetProvider，继承自AppWidgetProvider，用于管理便签Widget
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public abstract class NoteWidgetProvider extends AppWidgetProvider {
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// 定义查询数据库时使用的列名数组
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public static final String [] PROJECTION = new String [] {
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NoteColumns.ID,
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NoteColumns.BG_COLOR_ID,
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NoteColumns.SNIPPET
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};
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// 定义数组中每个列的索引常量
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public static final int COLUMN_ID = 0;
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public static final int COLUMN_BG_COLOR_ID = 1;
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public static final int COLUMN_SNIPPET = 2;
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// 定义日志标签
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private static final String TAG = "NoteWidgetProvider";
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// 当Widget被删除时调用的方法
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@Override
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public void onDeleted(Context context, int[] appWidgetIds) {
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// 为数据库更新准备ContentValues对象
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ContentValues values = new ContentValues();
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// 设置WIDGET_ID为无效值
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values.put(NoteColumns.WIDGET_ID, AppWidgetManager.INVALID_APPWIDGET_ID);
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// 遍历所有被删除的Widget ID
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for (int i = 0; i < appWidgetIds.length; i++) {
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// 更新数据库中对应的Widget ID为无效
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context.getContentResolver().update(Notes.CONTENT_NOTE_URI,
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values,
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NoteColumns.WIDGET_ID + "=?",
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new String[] { String.valueOf(appWidgetIds[i])});
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}
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}
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// 获取与特定Widget ID相关的便签信息
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private Cursor getNoteWidgetInfo(Context context, int widgetId) {
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// 查询数据库，获取便签信息
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return context.getContentResolver().query(Notes.CONTENT_NOTE_URI,
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PROJECTION,
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NoteColumns.WIDGET_ID + "=? AND " + NoteColumns.PARENT_ID + "<>?",
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new String[] { String.valueOf(widgetId), String.valueOf(Notes.ID_TRASH_FOLER) },
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null);
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}
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// 更新Widget的方法，可以被外部调用
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protected void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
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// 调用内部的update方法，不启用隐私模式
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update(context, appWidgetManager, appWidgetIds, false);
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}
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// 更新Widget的内部方法，根据是否启用隐私模式来更新Widget
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private void update(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds,
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boolean privacyMode) {
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// 遍历所有Widget ID
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for (int i = 0; i < appWidgetIds.length; i++) {
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// 如果Widget ID有效
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if (appWidgetIds[i] != AppWidgetManager.INVALID_APPWIDGET_ID) {
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// 获取默认背景ID
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int bgId = ResourceParser.getDefaultBgId(context);
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// 初始化摘要字符串
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String snippet = "";
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// 创建Intent，用于编辑便签
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Intent intent = new Intent(context, NoteEditActivity.class);
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intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
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intent.putExtra(Notes.INTENT_EXTRA_WIDGET_ID, appWidgetIds[i]);
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intent.putExtra(Notes.INTENT_EXTRA_WIDGET_TYPE, getWidgetType());
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// 获取便签信息的Cursor
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Cursor c = getNoteWidgetInfo(context, appWidgetIds[i]);
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// 如果Cursor不为空且第一条数据有效
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if (c != null && c.moveToFirst()) {
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// 如果有多条数据与Widget ID匹配，记录错误日志并返回
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if (c.getCount() > 1) {
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Log.e(TAG, "Multiple message with same widget id:" + appWidgetIds[i]);
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c.close();
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return;
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}
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// 从Cursor中获取摘要和背景ID
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snippet = c.getString(COLUMN_SNIPPET);
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bgId = c.getInt(COLUMN_BG_COLOR_ID);
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intent.putExtra(Intent.EXTRA_UID, c.getLong(COLUMN_ID));
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intent.setAction(Intent.ACTION_VIEW);
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} else {
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// 如果没有找到匹配的便签，设置摘要为默认字符串
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snippet = context.getResources().getString(R.string.widget_havenot_content);
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intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
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}
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// 关闭Cursor
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if (c != null) {
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c.close();
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}
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// 创建RemoteViews对象，用于更新Widget视图
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RemoteViews rv = new RemoteViews(context.getPackageName(), getLayoutId());
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// 设置背景图片资源ID
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rv.setImageViewResource(R.id.widget_bg_image, getBgResourceId(bgId));
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intent.putExtra(Notes.INTENT_EXTRA_BACKGROUND_ID, bgId);
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// 生成PendingIntent，用于启动宿主Activity
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PendingIntent pendingIntent = null;
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if (privacyMode) {
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// 如果启用隐私模式，显示隐私模式提示文本
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rv.setTextViewText(R.id.widget_text,
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context.getString(R.string.widget_under_visit_mode));
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pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], new Intent(
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context, NotesListActivity.class), PendingIntent.FLAG_UPDATE_CURRENT);
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} else {
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// 否则，显示便签摘要
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rv.setTextViewText(R.id.widget_text, snippet);
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pendingIntent = PendingIntent.getActivity(context, appWidgetIds[i], intent,
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PendingIntent.FLAG_UPDATE_CURRENT);
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}
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// 设置RemoteViews的PendingIntent
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rv.setOnClickPendingIntent(R.id.widget_text, pendingIntent);
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// 更新Widget
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appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
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}
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}
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}
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// 抽象方法，用于获取背景资源ID
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protected abstract int getBgResourceId(int bgId);
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// 抽象方法，用于获取布局ID
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protected abstract int getLayoutId();
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// 抽象方法，用于获取Widget类型
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protected abstract int getWidgetType();
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}
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